Games like Colourless
Games like Colourless include Hollow Knight, Skul: The Hero Slayer, Broforce, Geometry Dash, and Dust: An Elysian Tail. We matched them by the tags players give Colourless on Steam (Indie, Platformer, 2D, Action, and Colorful): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · 2D

Skul: The Hero Slayer
Shared: Indie · Action · 2D

Broforce
Shared: Action · 2D · Platformer

Geometry Dash
Shared: 2D · Platformer · Indie

Dust: An Elysian Tail
Shared: Platformer · Indie · Action

Rogue Legacy
Shared: Platformer · Indie · Action

Hollow Knight: Silksong
Shared: Indie · 2D · Platformer

Katana ZERO
Shared: Action · Platformer · Indie

BlazBlue Entropy Effect
Shared: 2D · Action · Platformer

Cuphead
Shared: Platformer · 2D · Indie

Nine Sols
Shared: 2D · Platformer · Action

Pizza Tower
Shared: Indie · Platformer · Action

Mark of the Ninja
Shared: Platformer · Indie · 2D

Guacamelee! Super Turbo Championship Edition
Shared: Platformer · 2D · Action

Guacamelee! Gold Edition
Shared: Platformer · Indie · Action

Awesomenauts
Shared: 2D · Platformer · Indie

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · 2D

Risk of Rain (2013)
Shared: Indie · Platformer · Action

Monster Boy and the Cursed Kingdom
Shared: Indie · Action · Platformer

Super Meat Boy
Shared: Platformer · Indie · 2D

Spelunky
Shared: Platformer · Indie · 2D

Sonic Mania
Shared: Platformer · 2D · Colorful

BEEP
Shared: Indie · Platformer · 2D

LIMBO
Shared: Indie · Platformer · 2D